Association between bovine-leukosis virus seroprevalence and herd-level productivity on US dairy farms
Association between bovine-leukosis virus seroprevalence and herd-level productivity on US dairy farms
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DOI：
10.1016/j.prevetmed.2003.08.003
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发表时间：
2003-12-12
影响因子：
2.6
通讯作者：
Wells, SJ
中科院分区：
文献类型：
--
作者：
Ott, SL;Johnson, R;Wells, SJ
牛白血病病毒（BLV;也称为“牛白血病病毒”）是一种主要影响奶牛和肉牛淋巴组织的逆转录病毒。我们的目的是调查美国境内奶牛群BLV感染和年产值（AVP）之间的关联，作为美国农业部国家动物健康监测系统1996年奶牛研究的一部分。1006牛群（在20个州）至少有30头奶牛在1996年进行了采访。用琼脂免疫扩散试验检测血清中BLV抗体。对976头奶牛进行多因素回归分析，结果表明，每头奶牛检测10-40头，根据单次检测结果分为阴性和阳性两类。与无检测阳性奶牛的牛群相比，检测阳性奶牛的牛群每头奶牛产奶量减少218 kg（即3%）。相对于测试阴性牛群，测试阳性牛群的AVP平均降低为每头奶牛59美元。对于整个乳制品行业来说，BLV血清阳性与生产者2.85亿美元和消费者2.4亿美元的损失有关。在这5.25亿美元的行业损失中，大部分是由于检测呈阳性的牛群的牛奶产量减少。(C)2003年爱思唯尔B. V.保留所有战斗。
Bovine-leukosis virus (BLV; also termed 'bovine-leukemia virus') is a retrovirus that primarily affects lymphoid tissue of dairy and beef cattle. Our objective was to investigate the association between BLV infection and annual value of production (AVP) on dairy herds within the United States, as part of the USDA National Animal Health Monitoring System's 1996 dairy study. 1006 herds (in 20 states) with at least 30 dairy cows were interviewed during 1996. The agar-get immunodiffusion test was used to detect serum antibodies to BLV. 10-40 cows from each herd were tested and each tested cow was classified as negative or positive based on results of a single test.A multivariable regression model was used with the 976 herds with complete data for analysis. When compared to herds with no test-positive cows, herds with test-positive cows produced 218 kg per cow (i.e. 3%) less milk. The average reduction in AVP was $ 59 per cow for test-positive herds relative to test-negative herds. For the dairy industry as a whole, BLV seropositivity was associated with loss to producers of $ 285 million and $ 240 million for consumers. Most of this $ 525 million industry loss was due to reduced milk production in test-positive herds. (C) 2003 Elsevier B.V. All fights reserved.